Hi I have an iPhone 4, on firmware 4.0.2. Its unlocked for T-Mobile and I used Supreme Preferences to make the Cellular Data Network tab show up. Now that I have done this, I put in the Cellular Data tab APN this: internet2.voicestream.com . After doing this, my internet still won't work. Data roaming is on. Anyone know how I can make it work? Please and thank you.